Question

Find the no.Of prime no that are smaller than the larger no.Among given 2 no.

Answer 1

There is no known expicit formula for this, but we do know how this function behaves asymptotically, that is the famous prime-number theorem. It states that

π(n)≈n/ln(n)

But there are certain algorithms for calculating this function. One such example is here Computing π(x): The Meissel, Lehmer, Lagarias, Miller, Odlyzko method